CVE-2026-43194
published 2026-05-06CVE-2026-43194: In the Linux kernel, the following vulnerability has been resolved: net: consume xmit errors of GSO frames udpgro_frglist.sh and udpgro_bench.sh are the…
PriorityP342high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.53%
41.4th percentile
In the Linux kernel, the following vulnerability has been resolved:
net: consume xmit errors of GSO frames
udpgro_frglist.sh and udpgro_bench.sh are the flakiest tests
currently in NIPA. They fail in the same exact way, TCP GRO
test stalls occasionally and the test gets killed after 10min.
These tests use veth to simulate GRO. They attach a trivial
("return XDP_PASS;") XDP program to the veth to force TSO off
and NAPI on.
Digging into the failure mode we can see that the connection
is completely stuck after a burst of drops. The sender's snd_nxt
is at sequence number N [1], but the receiver claims to have
received (rcv_nxt) up to N + 3 * MSS [2]. Last piece of the puzzle
is that senders rtx queue is not empty (let's say the block in
the rtx queue is at sequence number N - 4 * MSS [3]).
In this state, sender sends a retransmission from the rtx queue
with a single segment, and sequence numbers N-4*MSS:N-3*MSS [3].
Receiver sees it and responds with an ACK all the way up to
N + 3 * MSS [2]. But sender will reject this ack as TCP_ACK_UNSENT_DATA
because it has no recollection of ever sending data that far out [1].
And we are stuck.
The root cause is the mess of the xmit return codes. veth returns
an error when it can't xmit a frame. We end up with a loss event
like this:
| GSO super frame 1 | GSO super frame 2 |
|-----------------------------------------------|
| seg | seg | seg | seg | seg | seg | seg | seg |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
x ok ok | ok ok ok
\\
snd_nxt
"x" means packet lost by veth, and "ok" means it went thru.
Since veth has TSO disabled in this test it sees individual segments.
Segment 1 is on the retransmit queue and will be resent.
So why did the sender not advance snd_nxt even tho it clearly did
send up to seg 8? tcp_write_xmit() interprets the return code
from the core to mean that data has not been sent at all. Since
TCP deals with GSO super frames, not individual segment the crux
of the problem is that loss of a single segment can b
Affected
44 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 1f59533f9ca5634e7b8914252e48aee9d9cbe501 < ae3f627b45fbc3c776a4e484696f3cad7cbb4eca | ae3f627b45fbc3c776a4e484696f3cad7cbb4eca |
| linux | linux | >= 1f59533f9ca5634e7b8914252e48aee9d9cbe501 < 0c9de092ef8c50a7ee9612811566f0aa81d8d7b6 | 0c9de092ef8c50a7ee9612811566f0aa81d8d7b6 |
| linux | linux | >= 1f59533f9ca5634e7b8914252e48aee9d9cbe501 < 56bd32c0edca34041a5c215887fcf562fae2e2db | 56bd32c0edca34041a5c215887fcf562fae2e2db |
| linux | linux | >= 1f59533f9ca5634e7b8914252e48aee9d9cbe501 < 9ac6aebef4b4bfc5ed408b0b65645981574bc780 | 9ac6aebef4b4bfc5ed408b0b65645981574bc780 |
| linux | linux | >= 1f59533f9ca5634e7b8914252e48aee9d9cbe501 < ea5d7787635e26ec1194ec7eec0e8e5ae3bd10a5 | ea5d7787635e26ec1194ec7eec0e8e5ae3bd10a5 |
| linux | linux | >= 1f59533f9ca5634e7b8914252e48aee9d9cbe501 < 4cb163e9efcac4cd35c3043e097f25081a5c015c | 4cb163e9efcac4cd35c3043e097f25081a5c015c |
| linux | linux | >= 1f59533f9ca5634e7b8914252e48aee9d9cbe501 < c86901d22c89a6bf4e2f013e948aaabc60869893 | c86901d22c89a6bf4e2f013e948aaabc60869893 |
| linux | linux | >= 1f59533f9ca5634e7b8914252e48aee9d9cbe501 < 7aa767d0d3d04e50ae94e770db7db8197f666970 | 7aa767d0d3d04e50ae94e770db7db8197f666970 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 3.18 < 5.10.252 | 5.10.252 |
| linux | linux_kernel | >= 5.11 < 5.15.202 | 5.15.202 |
| linux | linux_kernel | >= 5.16 < 6.1.165 | 6.1.165 |
| linux | linux_kernel | >= 6.13 < 6.18.16 | 6.18.16 |
| linux | linux_kernel | >= 6.19 < 6.19.6 | 6.19.6 |
| linux | linux_kernel | >= 6.2 < 6.6.128 | 6.6.128 |
| linux | linux_kernel | >= 6.7 < 6.12.75 | 6.12.75 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-6.8 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure-fips | — | — |
| ubuntu | linux-fips | — | — |
| ubuntu | linux-gcp | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_ubuntu8.8HIGH
vendor_redhat5.5LOW
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Ubuntu
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Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
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Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Hardwar
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vendor_ubuntu·2026-07-06
CVE-2026-43314 Linux kernel (Raspberry Pi Real-time) vulnerabilities
Title: Linux kernel (Raspberry Pi Real-time) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-07-02
CVE-2026-43314 Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Hardware monitoring dr
Ubuntu
Linux kernel (Low Latency) vulnerabilities
vendor_ubuntu·2026-07-02·CVSS 8.8
CVE-2026-43314 [HIGH] Linux kernel (Low Latency) vulnerabilities
Title: Linux kernel (Low Latency) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
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container. (CVE-2026-43284, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000)
It was discovered that a logic flaw existed in the XFRM ESP-in-TCP
subsystem in the Linux kernel when handling socket buffer fragments. This
flaw is known as Fragnesia. A local attacker could use this to escalate
privileges, or possibly escape a conta
Ubuntu
Linux kernel (Xilinx) vulnerabilities
vendor_ubuntu·2026-07-02·CVSS 7.8
CVE-2026-43314 [HIGH] Linux kernel (Xilinx) vulnerabilities
Title: Linux kernel (Xilinx) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the Linux kernel algif_aead module did not properly
handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)
It was discovered that the Linux kernel did not properly handle shared page
fragments during socket buffer operations, collectively known as Dirty
Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the
RxRPC networking subsystem when processing paged fragments. A local
attacker could use this to escalate privileges, or possibly escape a
container. (CVE-2026-43284, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000)
Ubuntu
Linux kernel (NVIDIA Tegra) vulnerabilities
vendor_ubuntu·2026-07-02
CVE-2026-43314 Linux kernel (NVIDIA Tegra) vulnerabilities
Title: Linux kernel (NVIDIA Tegra) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Hardwar
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-07-01
CVE-2026-43226 Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Hardware monitoring dr
Red Hat
kernel: net: consume xmit errors of GSO frames
vendor_redhat·2026-05-06·CVSS 5.5
CVE-2026-43194 [LOW] CWE-544 kernel: net: consume xmit errors of GSO frames
kernel: net: consume xmit errors of GSO frames
A flaw was found in the Linux kernel's networking subsystem. Specifically, the kernel incorrectly processes transmit errors for Generic Segmentation Offload (GSO) frames. When a single segment within a GSO frame is lost, the system may misinterpret this as a complete loss of the entire frame. This can lead to Transmission Control Protocol (TCP) connections becoming unresponsive, resulting in a Denial of Service (DoS) for network communications.
Package: kernel (Red Hat Enterprise Linux 10) - Fix deferred
Package: kernel (Red Hat Enterprise Linux 6) - Out of support scope
Package: kernel (Red Hat Enterprise Linux 7) - Fix deferred
Package: kernel-rt (Red Hat Enterprise Linux 7) - Fix deferred
Package: kernel (Red Hat Enterprise Linux 8) -
GHSA
GHSA-6g7r-xrvq-rpc8: In the Linux kernel, the following vulnerability has been resolved:
net: consume xmit errors of GSO frames
udpgro_frglist
ghsa_unreviewed·2026-05-06
CVE-2026-43194 GHSA-6g7r-xrvq-rpc8: In the Linux kernel, the following vulnerability has been resolved:
net: consume xmit errors of GSO frames
udpgro_frglist
In the Linux kernel, the following vulnerability has been resolved:
net: consume xmit errors of GSO frames
udpgro_frglist.sh and udpgro_bench.sh are the flakiest tests
currently in NIPA. They fail in the same exact way, TCP GRO
test stalls occasionally and the test gets killed after 10min.
These tests use veth to simulate GRO. They attach a trivial
("return XDP_PASS;") XDP program to the veth to force TSO off
and NAPI on.
Digging into the failure mode we can see that the connection
is completely stuck after a burst of drops. The sender's snd_nxt
is at sequence number N [1], but the receiver claims to have
received (rcv_nxt) up to N + 3 * MSS [2]. Last piece of the puzzle
is that senders rtx queue is not empty (let's say the block in
the rtx queue is at sequence number N - 4 * MSS [3]).
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/0c9de092ef8c50a7ee9612811566f0aa81d8d7b6https://git.kernel.org/stable/c/4cb163e9efcac4cd35c3043e097f25081a5c015chttps://git.kernel.org/stable/c/56bd32c0edca34041a5c215887fcf562fae2e2dbhttps://git.kernel.org/stable/c/7aa767d0d3d04e50ae94e770db7db8197f666970https://git.kernel.org/stable/c/9ac6aebef4b4bfc5ed408b0b65645981574bc780https://git.kernel.org/stable/c/ae3f627b45fbc3c776a4e484696f3cad7cbb4ecahttps://git.kernel.org/stable/c/c86901d22c89a6bf4e2f013e948aaabc60869893https://git.kernel.org/stable/c/ea5d7787635e26ec1194ec7eec0e8e5ae3bd10a5
2026-05-06
Published